Inconsistent profile creation

[sonia]

Inconsistent profile creation: profiles created via Profile Manager (-P) vs. hamburger menu are not mutually visible

Steps to reproduce:
1. Close all Firefox windows.
2. Launch Firefox using the Profile Manager (firefox -P) and create a new profile A.
3. Close Firefox and start Firefox normally.
4. Open the hamburger menu → [Profile] or Menu → More Tools → Manage Profiles. Profile A is not listed.
5. Now create profile B from the hamburger menu (or Menu → More Tools → Manage Profiles → Create).
6. In a new test, create a profile via the Profile Manager; profile B may not appear there.

Expected result:
Profiles created by either the Profile Manager (-P / -profile) or the in‑browser hamburger menu/profile UI appear in both about:profiles and the in‑browser Profile Switcher/hamburger menu, without extra manual steps.

Actual result:
Profiles created via the standalone Profile Manager show in about:profiles but are not available in the hamburger menu/profile switcher. Profiles created via the hamburger menu sometimes do not show in the Profile Manager. Users must manually link folders via “Choose Folder” or recreate profiles to sync them.

Impact:
Confusing UX for non-technical users, risk of duplicate profiles, accidental profile data fragmentation, and extra steps required to make profiles usable across UI flows.

Platform:
 Windows 11, Firefox 149

Suggested fix (brief):
Unify profile registration so profiles created via any method register in the same profile registry and show up in both about:profiles and the in‑browser profile switcher; ensure shortcuts without explicit -profile flags reflect the unified registry.

[Jon]

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